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PHP 8.1.34
Preview: Classifier.php Size: 14.00 KB
/home2/astrociv/www/avadhutholidays.in/wp-content/plugins/imunify-security/inc/App/Bot/Classifier.php
<?php
/**
 * Copyright (с) Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2025 All Rights Reserved
 *
 * Licensed under CLOUD LINUX LICENSE AGREEMENT
 * https://www.cloudlinux.com/legal/
 */

namespace CloudLinux\Imunify\App\Bot;

/**
 * Bot classification engine.
 *
 * Composes the UA signature matcher, anti-spoofing real-IP resolver, bot-IP
 * range lookups, datacenter detector, and header anomaly scorer into a
 * single classify() call that returns a {@see Classification} — one of the
 * six Category constants paired with the matched bot signature token.
 *
 * Bundled IP ranges are held per category, one lookup covering every provider
 * in it. A UA whose signature token names a provider is verified against that
 * provider's ranges alone, so an Applebot claim cannot be confirmed by a
 * Googlebot address; a token with no provider attribution is still verified
 * against the whole category. See {@see ipConfirmsClaim()}.
 *
 * Decision pipeline (order matters):
 *   1. Honeypot triggered                              -> MALICIOUS_BOT
 *   2. UA matches malicious tool signature             -> MALICIOUS_BOT
 *   3. UA matches search-engine signature + IP in bundled range -> VERIFIED_SEARCH_ENGINE
 *      UA matches search-engine signature + IP not in range, but rDNS verifier
 *                                          forward-confirms a provider suffix -> VERIFIED_SEARCH_ENGINE
 *      UA matches search-engine signature otherwise   -> UNVERIFIED_BOT
 *   4. UA matches seo-crawler signature + IP in bundled range -> VERIFIED_SEO_CRAWLER
 *      UA matches seo-crawler signature + IP not in range, but rDNS verifier
 *                                          forward-confirms a provider suffix -> VERIFIED_SEO_CRAWLER
 *      UA matches seo-crawler signature otherwise      -> UNVERIFIED_BOT
 *   5. UA matches ai-crawler signature + IP matches    -> VERIFIED_AI_CRAWLER
 *      UA's matched token + IP in that token's own ranges -> VERIFIED_AI_CRAWLER
 *      UA matches ai-crawler signature + IP not in range, but rDNS verifier
 *                                          forward-confirms a provider suffix -> VERIFIED_AI_CRAWLER
 *      UA matches ai-crawler signature + IP not in range, but ClaudeBot UA
 *                                          from datacenter IP (weak verify)   -> VERIFIED_AI_CRAWLER
 *      UA matches ai-crawler signature otherwise      -> UNVERIFIED_BOT
 *   6. Empty / whitespace-only UA                      -> UNVERIFIED_BOT
 *   7. Datacenter IP + at least one header anomaly     -> UNKNOWN_AUTOMATED
 *   8. Otherwise                                       -> HUMAN
 *
 * The real client IP is determined by RealIpResolver before any verification
 * step runs, so forged CDN headers from a direct attacker never succeed in
 * impersonating a verified bot provider.
 *
 * @since 4.0.0
 */
class Classifier {

	/**
	 * Minimum header anomaly score that promotes a datacenter-origin
	 * request to Unknown Automated. One anomaly is a very low bar,
	 * intentionally — the classifier only reaches this branch when no
	 * bot UA matched, so a genuinely clean browser request from a
	 * datacenter IP is still left as HUMAN.
	 */
	const UNKNOWN_AUTOMATED_MIN_ANOMALIES = 1;

	/**
	 * UA signature matcher configured with malicious / search-engine / ai-crawler categories.
	 *
	 * @var UserAgentSignatures
	 */
	private $ua_signatures;

	/**
	 * Anti-spoofing resolver used to derive the real client IP before verification.
	 *
	 * @var RealIpResolver
	 */
	private $real_ip_resolver;

	/**
	 * Bot-IP lookup restricted to verified search-engine providers.
	 *
	 * @var IpRangeLookup
	 */
	private $search_engine_ips;

	/**
	 * Bot-IP lookup restricted to verified AI-crawler providers.
	 *
	 * @var IpRangeLookup
	 */
	private $ai_crawler_ips;

	/**
	 * Bot-IP lookup restricted to verified SEO-crawler providers.
	 *
	 * @var IpRangeLookup
	 */
	private $seo_crawler_ips;

	/**
	 * Datacenter IP detector driving the Unknown Automated signal.
	 *
	 * @var DatacenterDetector
	 */
	private $datacenter;

	/**
	 * Optional rDNS verifier for search-engine providers whose IP ranges
	 * are not bundled (Yandex, Baidu, Sogou, Seznam, Naver, Mojeek).
	 *
	 * @var RdnsVerifier|null
	 */
	private $rdns_verifier;

	/**
	 * Optional rDNS verifier for AI-crawler providers whose IP ranges
	 * are not bundled (Amazonbot, CCBot, Bytespider, YouBot).
	 *
	 * @var RdnsVerifier|null
	 */
	private $ai_rdns_verifier;

	/**
	 * Optional rDNS verifier for SEO-crawler providers that publish a
	 * documented PTR suffix (Barkrowler / .babbar.eu).
	 *
	 * @var RdnsVerifier|null
	 */
	private $seo_rdns_verifier;

	/**
	 * Optional lookup keyed by lower-cased ai-crawler token, for ranges that
	 * confirm one token only and so stay out of $ai_crawler_ips. Anthropic's
	 * outbound range is the case: every API customer's MCP and web-fetch
	 * traffic leaves from it, so it may confirm Claude-User but no other claim.
	 *
	 * @var IpRangeLookup|null
	 */
	private $ai_token_ips;

	/**
	 * Wire up the classifier over its component primitives.
	 *
	 * @param UserAgentSignatures $ua_signatures     UA matcher with malicious / search-engine / seo-crawler / ai-crawler categories.
	 * @param RealIpResolver      $real_ip_resolver  Anti-spoofing client-IP resolver.
	 * @param IpRangeLookup       $search_engine_ips Bot-IP lookup for verified search engines.
	 * @param IpRangeLookup       $ai_crawler_ips    Bot-IP lookup for verified AI crawlers.
	 * @param IpRangeLookup       $seo_crawler_ips   Bot-IP lookup for verified SEO crawlers.
	 * @param DatacenterDetector  $datacenter        Datacenter IP detector for Unknown Automated signal.
	 * @param RdnsVerifier|null   $rdns_verifier     Optional FCrDNS verifier for non-bundled search-engine providers.
	 * @param RdnsVerifier|null   $ai_rdns_verifier  Optional FCrDNS verifier for non-bundled AI-crawler providers.
	 * @param RdnsVerifier|null   $seo_rdns_verifier Optional FCrDNS verifier for SEO-crawler providers with a documented PTR suffix.
	 * @param IpRangeLookup|null  $ai_token_ips      Optional lookup keyed by lower-cased ai-crawler token, confirming that token alone.
	 */
	public function __construct(
		$ua_signatures,
		$real_ip_resolver,
		$search_engine_ips,
		$ai_crawler_ips,
		$seo_crawler_ips,
		$datacenter,
		$rdns_verifier = null,
		$ai_rdns_verifier = null,
		$seo_rdns_verifier = null,
		$ai_token_ips = null
	) {
		$this->ua_signatures     = $ua_signatures;
		$this->real_ip_resolver  = $real_ip_resolver;
		$this->search_engine_ips = $search_engine_ips;
		$this->ai_crawler_ips    = $ai_crawler_ips;
		$this->seo_crawler_ips   = $seo_crawler_ips;
		$this->datacenter        = $datacenter;
		$this->rdns_verifier     = $rdns_verifier;
		$this->ai_rdns_verifier  = $ai_rdns_verifier;
		$this->seo_rdns_verifier = $seo_rdns_verifier;
		$this->ai_token_ips      = $ai_token_ips;
	}

	/**
	 * Classify a request into one of the six Category values plus the matched
	 * bot signature.
	 *
	 * The returned {@see Classification} pairs the category with the signature
	 * token that produced it (e.g. "GPTBot"). The token is populated only on
	 * the three UA-signature branches — malicious, search-engine, ai-crawler,
	 * including their UNVERIFIED_BOT downgrades — and is '' for honeypot,
	 * empty-UA, datacenter-heuristic, and human outcomes, none of which come
	 * from a named signature.
	 *
	 * @param array  $headers            Request headers (case-insensitive keys).
	 * @param string $remote_addr        Socket peer IP.
	 * @param string $server_protocol    Value of $_SERVER['SERVER_PROTOCOL'] (e.g. "HTTP/2.0").
	 * @param bool   $honeypot_triggered Whether the pipeline detected a honeypot hit.
	 * @return Classification Category + matched signature token.
	 */
	public function classify( $headers, $remote_addr, $server_protocol = '', $honeypot_triggered = false ) {
		if ( true === $honeypot_triggered ) {
			return new Classification( Category::MALICIOUS_BOT );
		}

		$normalised = RealIpResolver::normaliseHeaders( $headers );
		$ua         = isset( $normalised['user-agent'] ) && is_string( $normalised['user-agent'] )
			? $normalised['user-agent']
			: '';
		$client_ip  = $this->real_ip_resolver->resolveFromNormalised( $normalised, $remote_addr );

		// Check UA categories in Classifier's documented priority order rather
		// than delegating to UserAgentSignatures::classify(), which returns the
		// first match in *its* registration order. Bundled token lists overlap
		// (e.g. "Scrapy" in ai-crawler and malicious), so enforcing priority
		// here is load-bearing: a UA that matches both categories must take
		// the higher-priority classification.
		if ( $this->ua_signatures->matchesCategory( $ua, UserAgentSignatures::CATEGORY_MALICIOUS ) ) {
			$bot = $this->ua_signatures->matchedToken( $ua, UserAgentSignatures::CATEGORY_MALICIOUS );
			return new Classification( Category::MALICIOUS_BOT, $bot );
		}

		if ( $this->ua_signatures->matchesCategory( $ua, UserAgentSignatures::CATEGORY_SEARCH_ENGINE ) ) {
			$bot = $this->ua_signatures->matchedToken( $ua, UserAgentSignatures::CATEGORY_SEARCH_ENGINE );
			if ( $this->ipConfirmsClaim( $this->search_engine_ips, $client_ip, $ua, UserAgentSignatures::CATEGORY_SEARCH_ENGINE ) ) {
				return new Classification( Category::VERIFIED_SEARCH_ENGINE, $bot );
			}
			// Bundled IP range missed — fall through to forward-confirmed
			// reverse DNS for providers whose ranges we don't ship
			// (Yandex/Baidu/Sogou/Seznam/Naver/Mojeek) and for Apple, whose
			// published file omits IPv4 blocks its own DNS names as Applebot
			// and carries no IPv6. The verifier is
			// optional; when not wired, behaviour matches Phase-0: UA
			// match without IP confirmation drops to UNVERIFIED_BOT.
			if ( null !== $this->rdns_verifier && $this->rdns_verifier->verifyAgainstUa( $client_ip, $ua ) ) {
				return new Classification( Category::VERIFIED_SEARCH_ENGINE, $bot );
			}
			return new Classification( Category::UNVERIFIED_BOT, $bot );
		}

		if ( $this->ua_signatures->matchesCategory( $ua, UserAgentSignatures::CATEGORY_SEO_CRAWLER ) ) {
			$bot = $this->ua_signatures->matchedToken( $ua, UserAgentSignatures::CATEGORY_SEO_CRAWLER );
			if ( $this->ipConfirmsClaim( $this->seo_crawler_ips, $client_ip, $ua, UserAgentSignatures::CATEGORY_SEO_CRAWLER ) ) {
				return new Classification( Category::VERIFIED_SEO_CRAWLER, $bot );
			}
			// Bundled IP range missed — try forward-confirmed reverse DNS for
			// SEO crawlers that publish a PTR suffix (Barkrowler / .babbar.eu).
			// SEO crawlers without any published IP list or rDNS (SemrushBot,
			// DotBot, MJ12bot) never reach a verify path and drop to
			// UNVERIFIED_BOT — the intended throttle for third-party index bots.
			if ( null !== $this->seo_rdns_verifier && $this->seo_rdns_verifier->verifyAgainstUa( $client_ip, $ua ) ) {
				return new Classification( Category::VERIFIED_SEO_CRAWLER, $bot );
			}
			return new Classification( Category::UNVERIFIED_BOT, $bot );
		}

		if ( $this->ua_signatures->matchesCategory( $ua, UserAgentSignatures::CATEGORY_AI_CRAWLER ) ) {
			$bot = $this->ua_signatures->matchedToken( $ua, UserAgentSignatures::CATEGORY_AI_CRAWLER );
			if ( $this->ipConfirmsClaim( $this->ai_crawler_ips, $client_ip, $ua, UserAgentSignatures::CATEGORY_AI_CRAWLER ) ) {
				return new Classification( Category::VERIFIED_AI_CRAWLER, $bot );
			}
			if ( null !== $this->ai_token_ips && $this->ai_token_ips->matchesProvider( $client_ip, strtolower( $bot ) ) ) {
				return new Classification( Category::VERIFIED_AI_CRAWLER, $bot );
			}
			if ( null !== $this->ai_rdns_verifier && $this->ai_rdns_verifier->verifyAgainstUa( $client_ip, $ua ) ) {
				return new Classification( Category::VERIFIED_AI_CRAWLER, $bot );
			}
			if ( $this->isClaudeBot( $ua ) && 'aws' === $this->datacenter->provider( $client_ip ) ) {
				return new Classification( Category::VERIFIED_AI_CRAWLER, $bot );
			}
			return new Classification( Category::UNVERIFIED_BOT, $bot );
		}

		// Empty / whitespace-only UA is a strong bot signal: well-behaved
		// HTTP clients identify themselves, including most CLI tools
		// (curl, wget) and headless browsers. Empty-UA traffic from any
		// IP is overwhelmingly automated. Wordfence's reference design
		// treats it as "always crawler"; we land it as UNVERIFIED_BOT
		// (BALANCED preset → 2 req/min) rather than HUMAN. Allowlist
		// matchers run BEFORE classify() in Pipeline::runInner, so
		// wp-cron loopbacks, monitoring services with documented
		// empty-UA quirks, and similar internals stay unaffected.
		if ( '' === trim( $ua ) ) {
			return new Classification( Category::UNVERIFIED_BOT );
		}

		if ( $this->datacenter->isDatacenter( $client_ip ) ) {
			$anomalies = HeaderAnomalyScorer::scoreFromNormalised( $normalised, $server_protocol );
			if ( $anomalies >= self::UNKNOWN_AUTOMATED_MIN_ANOMALIES ) {
				return new Classification( Category::UNKNOWN_AUTOMATED );
			}
		}

		return new Classification( Category::HUMAN );
	}

	/**
	 * Whether $ip falls inside the bundled ranges of the provider the UA claims.
	 *
	 * Each category's lookup holds every provider in that category, so a bare
	 * find() lets one provider's ranges verify another provider's UA — an
	 * Applebot claim from a Googlebot address. When the matched signature has
	 * a known owner the check is narrowed to that owner's ranges.
	 *
	 * Tokens with no owner in the bundled provider map keep the merged-lookup
	 * behaviour, so the maps can be extended one provider at a time.
	 *
	 * @param IpRangeLookup $lookup   Bot-IP lookup for the category.
	 * @param string        $ip       Resolved client IP.
	 * @param string        $ua       Raw User-Agent header.
	 * @param string        $category UA signature category that matched.
	 * @return bool
	 */
	private function ipConfirmsClaim( $lookup, $ip, $ua, $category ) {
		$provider = $this->ua_signatures->matchedProvider( $ua, $category );
		if ( null === $provider ) {
			return null !== $lookup->find( $ip );
		}
		return $lookup->matchesProvider( $ip, $provider );
	}

	/**
	 * Check whether the UA identifies as ClaudeBot.
	 *
	 * @param string $ua User-Agent string.
	 * @return bool
	 */
	private function isClaudeBot( $ua ) {
		return 1 === preg_match( '/\bClaudeBot\b/i', $ua );
	}
}

Directory Contents

Dirs: 1 × Files: 77
Name Size Perms Modified Actions
data DIR
- drwxr-xr-x 2026-11-03 01:06:32
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AllowlistCheck.php
11.48 KB lrw-r--r-- 2026-11-03 01:06:32
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AllowlistMatch.php
2.43 KB lrw-r--r-- 2026-11-03 01:06:32
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AllowlistMatcher.php
1.47 KB lrw-r--r-- 2026-11-03 01:06:32
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AllowlistType.php
1.38 KB lrw-r--r-- 2026-11-03 01:06:32
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AtomicFileWriter.php
4.45 KB lrw-r--r-- 2026-11-03 01:06:32
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BasePath.php
1.17 KB lrw-r--r-- 2026-11-03 01:06:32
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BlockStorageInterface.php
2.01 KB lrw-r--r-- 2026-11-03 01:06:32
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BotDataConverter.php
21.21 KB lrw-r--r-- 2026-11-03 01:06:32
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BotIpStats.php
7.34 KB lrw-r--r-- 2026-11-03 01:06:32
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BotLifecycle.php
17.81 KB lrw-r--r-- 2026-11-03 01:06:32
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BotSettingsWriter.php
3.38 KB lrw-r--r-- 2026-11-03 01:06:32
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BotShimManager.php
2.79 KB lrw-r--r-- 2026-11-03 01:06:32
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BotStatsExporter.php
13.17 KB lrw-r--r-- 2026-11-03 01:06:32
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BotTrafficStats.php
8.77 KB lrw-r--r-- 2026-11-03 01:06:32
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BotTrafficSummary.php
5.67 KB lrw-r--r-- 2026-11-03 01:06:32
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BundledData.php
14.53 KB lrw-r--r-- 2026-11-03 01:06:32
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Category.php
4.25 KB lrw-r--r-- 2026-11-03 01:06:32
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CdnDetector.php
1.72 KB lrw-r--r-- 2026-11-03 01:06:32
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CidrMatcher.php
7.58 KB lrw-r--r-- 2026-11-03 01:06:32
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Classification.php
1.55 KB lrw-r--r-- 2026-11-03 01:06:32
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Classifier.php
14.00 KB lrw-r--r-- 2026-11-03 01:06:32
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CounterStorageInterface.php
1.58 KB lrw-r--r-- 2026-11-03 01:06:32
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DailyBotAggregator.php
5.99 KB lrw-r--r-- 2026-11-03 01:06:32
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DailyCounter.php
2.88 KB lrw-r--r-- 2026-11-03 01:06:32
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DatacenterDetector.php
1.41 KB lrw-r--r-- 2026-11-03 01:06:32
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DbErrorDetection.php
1.53 KB lrw-r--r-- 2026-11-03 01:06:32
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DbStorageFactory.php
2.61 KB lrw-r--r-- 2026-11-03 01:06:32
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HeaderAnomalyScorer.php
4.73 KB lrw-r--r-- 2026-11-03 01:06:32
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Honeypot.php
7.49 KB lrw-r--r-- 2026-11-03 01:06:32
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HourlyIpStatsStorage.php
17.86 KB lrw-r--r-- 2026-11-03 01:06:32
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HourlyStatsStorage.php
14.97 KB lrw-r--r-- 2026-11-03 01:06:32
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HttpClient.php
1.47 KB lrw-r--r-- 2026-11-03 01:06:32
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HttpResponse.php
4.76 KB lrw-r--r-- 2026-11-03 01:06:32
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IpNormalizer.php
2.06 KB lrw-r--r-- 2026-11-03 01:06:32
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IpRangeLookup.php
5.26 KB lrw-r--r-- 2026-11-03 01:06:32
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IpWhitelist.php
5.64 KB lrw-r--r-- 2026-11-03 01:06:32
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LoopbackResult.php
2.68 KB lrw-r--r-- 2026-11-03 01:06:32
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LoopbackSafetyTest.php
10.47 KB lrw-r--r-- 2026-11-03 01:06:32
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LoopbackStatus.php
2.49 KB lrw-r--r-- 2026-11-03 01:06:32
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MemoryBlockStorage.php
17.09 KB lrw-r--r-- 2026-11-03 01:06:32
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MemoryCounterStorage.php
8.51 KB lrw-r--r-- 2026-11-03 01:06:32
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MirrorDownloader.php
12.60 KB lrw-r--r-- 2026-11-03 01:06:32
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MirrorDownloadResult.php
3.46 KB lrw-r--r-- 2026-11-03 01:06:32
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MonitoringUaMatcher.php
835 B lrw-r--r-- 2026-11-03 01:06:32
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MonitoringUserAgents.php
1.71 KB lrw-r--r-- 2026-11-03 01:06:32
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MuLoader.php
22.44 KB lrw-r--r-- 2026-11-03 01:06:32
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MuPluginInstaller.php
5.65 KB lrw-r--r-- 2026-11-03 01:06:32
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MuPluginSelfHealer.php
7.33 KB lrw-r--r-- 2026-11-03 01:06:32
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NullBlockStorage.php
892 B lrw-r--r-- 2026-11-03 01:06:32
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NullCounterStorage.php
924 B lrw-r--r-- 2026-11-03 01:06:32
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OptOutFlag.php
4.69 KB lrw-r--r-- 2026-11-03 01:06:32
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Pipeline.php
18.57 KB lrw-r--r-- 2026-11-03 01:06:32
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Preset.php
6.92 KB lrw-r--r-- 2026-11-03 01:06:32
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RateLimitDecision.php
3.87 KB lrw-r--r-- 2026-11-03 01:06:32
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RateLimiter.php
7.94 KB lrw-r--r-- 2026-11-03 01:06:32
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RdnsVerifier.php
18.17 KB lrw-r--r-- 2026-11-03 01:06:32
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RealIpResolver.php
8.48 KB lrw-r--r-- 2026-11-03 01:06:32
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RequestAllowlist.php
1.80 KB lrw-r--r-- 2026-11-03 01:06:32
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Responder.php
9.49 KB lrw-r--r-- 2026-11-03 01:06:32
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RestNamespaceMatcher.php
2.84 KB lrw-r--r-- 2026-11-03 01:06:32
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RestRouteResolver.php
7.45 KB lrw-r--r-- 2026-11-03 01:06:32
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SafeInclude.php
1.28 KB lrw-r--r-- 2026-11-03 01:06:32
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SameServerMatcher.php
2.27 KB lrw-r--r-- 2026-11-03 01:06:32
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SelfOriginDetector.php
9.90 KB lrw-r--r-- 2026-11-03 01:06:32
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SignatureRefresher.php
15.82 KB lrw-r--r-- 2026-11-03 01:06:32
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SiteAllowlist.php
20.41 KB lrw-r--r-- 2026-11-03 01:06:32
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SiteAllowlistFile.php
7.79 KB lrw-r--r-- 2026-11-03 01:06:32
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SiteAllowlistStore.php
5.61 KB lrw-r--r-- 2026-11-03 01:06:32
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SiteAllowlistValidation.php
1.80 KB lrw-r--r-- 2026-11-03 01:06:32
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SiteAllowlistValidator.php
30.46 KB lrw-r--r-- 2026-11-03 01:06:32
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SiteOwnerMatcher.php
2.79 KB lrw-r--r-- 2026-11-03 01:06:32
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SiteScope.php
1.41 KB lrw-r--r-- 2026-11-03 01:06:32
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StorageEventBuffer.php
3.72 KB lrw-r--r-- 2026-11-03 01:06:32
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UserAgentSignatures.php
9.60 KB lrw-r--r-- 2026-11-03 01:06:32
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WooCommerceMatcher.php
5.05 KB lrw-r--r-- 2026-11-03 01:06:32
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WordPressInternalsMatcher.php
6.56 KB lrw-r--r-- 2026-11-03 01:06:32
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WpHttpClient.php
5.16 KB lrw-r--r-- 2026-11-03 01:06:32
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